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First, are you after a good apple brandy or such? Few questions here. By mash do you mean squeeze the juice out? That would be best. Hope you don't mean makeing a mash with enzymes like a grain mash? A simple trick that some use is to run the cored apples through a used or new sink disposal unless you have access to something like a vitamix. Grind it, and add sugar if you want a stronger, but less flavorable brew. Pectic enzyme is really good.
Freeze your apples before any processing. Helps to extract the juice and break down cell wall membranes for the fermenting process.

Any and all of it will work. just depends on what quality you want for the finished product. Even my mistakes have been good."